Gunite chimney



F. F. BEEBY GUNI'IE CHIMNEY Original Filed Nov. 24, 1919 2 Sheets-Sheet l Patented Aug. 25 1925.

UNITED STATES PATENT OFFICE.

FRANK F. BEEBY, OF CHICAGO, ILLINOIS, ASSIGNOB TO CEMENT-GUN CONSTRUCTION COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

GUN I'IE CHIMNEY.

Original application filed November 24, 1919, Serial No. 340,315. Divided and this application filed March 24, 1922, Serial No. 546,342.

To all whom it may concern:

Be it known that I, F RANK F. BEEBY, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Gunite Chimneys, of which the following is a specification.

This invention relates to reinforced concrete chimneys, and more particularly to concrete chimneys built about steel stacks already in place. It is a division of my application No. 340,315, filed November 24, 1919, now Patent 1,469,712, issued October 2, 1923. While it is particularly adapted to chimneys built about steel stacks, it may of course be applied to stacks otherwise constructed. My chimney is particularly adapted to be constructed by the projection of the type of concrete called gunite against the outer surface of the chimney, which surface acts as a base against which the cement hardens. In some forms I put an intermediate coating about the existing stack between it and the concrete chimney to be built. This coating may be of insulating material and may be yielding. In my invention I build about an already existing chimney a second complete independent chimney which is supported from and fixed to a permanent foundation, and which is built about but independent of the existing chimney so that that chimney may be completely destroyed without in any way affecting my chimney once the same has become hardened.

My invention is illustrated more or less diagrammatically in. the accompanying drawings, wherein Figure 1 is an elevation of my chimney with parts broken away;

Figure 2 is a plan view of the anchorage of my chimney;

Figure 3 is a section on the lines 33 of Fig. 1;

Figure 4 is a section on the lines 44 of Fig. 1.

Like parts are designated by like characters throughout.

A is any suitable base or supporting struc ture to which a steel chimney A is attached. A are anchor bolts, fixed in the base A and securing with the nuts A the members A which anchor the enlarged base of the steel chimney to its foundation. I employ this structure as an anchorage for my concrete chimney reinforcement. A are angle irons or any other suitable structural members secured to the members A by the bolts A and the nuts A and A are channel irons suitably secured to A, and extending about the chimney.

B are vertical reinforcing bars which may be hooked about and wired to the irons A or, where the length of the bar below the channel gives suflicient anchorage, may merely be grounded on the base A. B are horizontal circular reinforcing bars or bands, spaced along and secured to the bars B, in any suitable manner, as is common in reinforcing concrete structures. B is reinforcing netting or mesh disposed in one or more layers throughout the chimney structure. G is the gunite or concrete in which the reinforcement is imbedded.

My method of construction is as follows:

I build my concrete chimney about a steel stack which is weakening or leaking, or for any other reason needs strengthening or replacement. The steel stack serves as centering for the reinforcment, and acts as the base or mold against which the concrete is shot.

Steel stacks are firmly anchored to their foundations by anchor bolts imbedded in the masonry or concrete, which clamp the base of the chimney in place. I use these anchor bolts as the anchorage for my reinforcing structure. In the drawings, I illustrate a specific form of anchorage, but it will differ from stack to stack, and my invention is in no sense limited to the details of anchorage and reinforcement shown. In the illustrated form I secure channel irons to the anchor bolts, and use them as the anchorage of the concrete stack.

The reinforcement is the combination usual in the art of vertical rods, horizontal rods or hoops, wired to the verticals, and wire or expanded steel mesh. The vertical rods may be grounded on the foundation as in the illustrated form, or may be hooked about, or otherwise firmly secured to the structural members about the base of the stack. If the length of the bar below the channel structural member is considerable, it will be sufficiently anchored by the concrete to obviate the necessity of looping or hooking it about the member. The reinforcing structure is preferably spaced from the stack by any suitable means, such as wooden blocks which can be removed from any one point before it is reached by the level of the gunite. The reinforcing structure will thus be entirely out of contact with the stack, and cannot be attacked 0r rusted by gases or weather.

I/Vhen the reinforcement is in position, the stack may be shot by the well known gunite process, which consists in the projection against the stack of a thin cement, commonly called gunite, shot from a pressure nozzle. While I have described the cement of the chimney as being shot, and while it is preferably thus shot in place, it would be possible to place it by hand.

If necessary, the thick portion of the concrete, about the base of the stack may be poured into a mold. I prefer to construct the rest of the stack by projecting gunite against the steel stack until the reinforcement is covered to the desired thickness.

When the cement is all in place, and has hardened, the function of the steel stack ceases. It is surrounded by a reinforced concrete stack which will not be affected by the progressive disintegration of the steel stack, even if the steel stack entirely disappears.

I claim:

1. A double chimney comprising two chimney structures one within the other, and being each of them supported upon a foundation, said structures being structurally independent of each other.

2. A double chimney comprising two chimney structures one within the other, and being each of them secured to and supported upon a foundation, said structures being structurally independent of each other.

3. A double chimney comprising two chimney structures one within the other, and being each of them secured to and supported upon a foundation, each of said structures formed of different material and being structurally independent of each other and each adapted to stand without the other.

4. A double chimney comprising two chimney structures one within the other, and being each of them supported upon a foundation, said structures being structurally independent of each other, said outer structure adapted to remain standing when the inner structure shall have disappeared.

5. A double chimney comprising two chimney structures one within the other, and being each of them secured to and supported upon a foundation, said structures being structurally independent of each other, said outer structure adapted to remain standing when the inner structure shall have disappeared.

6. A double chimney comprising two chimney structures one within the other, the inner structure being metallic and the outer being formed of. concrete, each of said chimney structures supported upon a foundation and being structurally independent of each other and each adapted to stand without the other.

7 A double chimney comprising two chimney structures one within the other, the inner structure being metallic and the outer being formed of concrete, each of said chimney structures supported upon a foundation, said structures being independent of each other throughout their length whereby neither depends for its support upon the other.

8. A reinforced concrete chimney adapted to be formed about an existing chimney, said concrete chimney comprising a reinforcing placed about said existing chimney, and structurally independent therefrom and supported upon a foundation and concrete enclosing and imbedding said reinforcing and surrounding said existing chimney, said concrete chimney adapted to remain standing when the inner structure shall have disappeared.

Signed at Chicago county of Cook and State of Illinois, this 15th day of March 1922.

FRANK F. BEEBY. 

